UNS R60705 Zirconium WireComprehensive Guide for Engineers and Procurement Professionals？
- UNS R60705 Zirconium Wire
1. Introduction
UNS R60705 (Zr-2.5Nb) zirconium wire, as a high-strength zirconium alloy wire product, has extensive application prospects in nuclear industry, chemical engineering, marine engineering, and medical devices. This guide aims to help engineers and procurement professionals gain a comprehensive understanding of UNS R60705 zirconium wire, including material characteristics, technical standards, selection criteria, quality control, and supply chain management. Through this guide, readers will master the core knowledge and practical information needed to make more informed material selection and purchasing decisions.
2. Basic Information on UNS R60705 Zirconium Wire
UNS R60705 is the Unified Numbering System (UNS) designation for the Zr-2.5Nb zirconium alloy. This alloy belongs to the alpha-beta (α+β) dual-phase zirconium alloy family, with a niobium content of 2.0–3.0 wt%. It is a strengthened variant of commercially pure zirconium (Grade 2). The primary technical standards governing UNS R60705 zirconium wire include ASTM B551 (Standard Specification for Zirconium and Zirconium Alloy Bars and Rods) and GB/T 27634 (Standard for Nuclear-Grade Zirconium Alloy Wire Products).
3. Chemical Composition
The chemical composition requirements for UNS R60705 zirconium wire are as follows:
| Element | Specification |
| Zirconium (Zr) | Balance (≥96.0%) |
| Niobium (Nb) | 2.00–3.00% |
| Oxygen (O) | ≤0.18% |
| Iron (Fe) | ≤0.20% |
| Carbon (C) | ≤0.05% |
| Nitrogen (N) | ≤0.025% |
| Hydrogen (H) | ≤0.005% |
| Zr+Hf (Zirconium + Hafnium) | ≥60% (Hf content ≤4.5%) |
4. Mechanical Properties
The mechanical properties of UNS R60705 zirconium wire vary with diameter and heat treatment condition:
| Diameter Range (mm) | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
| ≤3.0 | 550–700 | 400–550 | ≥15 |
| 3.0–6.0 | 500–650 | 380–500 | ≥18 |
| 6.0–12.0 | 480–600 | 350–450 | ≥20 |
5. Physical Properties
| Property | Value |
| Density | 6.55 g/cm³ |
| Melting Point | 1855°C |
| Thermal Conductivity | 22.6 W/(m·K) at 25°C |
| Electrical Resistivity | 0.38 μΩ·m at 20°C |
| Linear Thermal Expansion Coefficient | 5.6×10⁻⁶/°C (20–100°C) |
6. Corrosion Resistance Performance
UNS R60705 zirconium wire exhibits excellent corrosion resistance in the following media:
| Corrosion Medium | Performance | Corrosion Rate | Applicable Conditions |
| Seawater | Excellent | <0.001 mm/year | Ambient – 100°C |
| 50% NaOH | Good | 0.01–0.05 mm/year | <80°C |
| 5% HCl | Not Applicable | >5 mm/year | — |
- Chloride solutions: No pitting or stress corrosion cracking observed
- Alkali solutions (NaOH ≤30%): Corrosion rate <0.01 mm/year
- Nitric acid (concentration ≤50%): Corrosion rate <0.05 mm/year
- Hydrofluoric acid: Not suitable (corrosion rate >5 mm/year)
7. Primary Application Areas
| Application Area | Specific Components | Key Performance Requirements | UNS R60705 Performance |
| Nuclear Industry | Position grid wires for fuel assemblies | High strength + low neutron absorption | Meets requirements |
| Chemical Equipment | Corrosion-resistant springs | Chloride corrosion resistance | Excellent |
| Marine Engineering | Deep-sea cable reinforcement | Seawater resistance + fatigue resistance | Good |
| Medical Devices | Orthopedic implants | Biocompatibility + high strength | Compliant with standards |
8. Procurement Guidelines and Quality Control
- Supplier Qualification: Select suppliers with nuclear-grade certifications (e.g., RCC-M, ASME III).
- Test Reports: Request EN 10204 Type 3.1 certificates, covering chemical composition, mechanical properties, and non-destructive examination (NDE) results.
- Packaging and Transportation: UNS R60705 zirconium wire should be vacuum-packaged or packaged under inert gas protection to prevent surface contamination during transportation.
- Storage Conditions: Store in dry, well-ventilated warehouses, away from acidic substances.
9. Conclusion
UNS R60705 zirconium wire plays an important role across multiple industrial sectors, leveraging its high strength, excellent corrosion resistance, and low neutron absorption cross-section. Engineers and procurement professionals should comprehensively evaluate material performance, service environment, and cost factors when selecting specifications and suppliers.
Material Comparison: UNS R60705 vs. Grade 2 vs. 316L Stainless Steel
| Performance Indicator | UNS R60705 | Grade 2 CP Zirconium | 316L Stainless Steel |
| Tensile Strength (MPa) | 550–700 | 340–450 | 515–620 |
| Density (g/cm³) | 6.55 | 6.52 | 8.0 |
| Seawater Corrosion Resistance | Excellent (<0.001 mm/year) | Excellent | Good (0.1 mm/year) |
| Neutron Absorption Cross-Section (barns) | 0.18 | 0.18 | 2.6 |
FAQ
Q1: What is the difference between UNS R60705 zirconium wire and Grade 2 commercially pure zirconium wire?
UNS R60705 is alloyed with 2.0–3.0% niobium, providing approximately 50–60% higher tensile strength than Grade 2. It also offers superior high-temperature performance and greater resistance to hydrogen embrittlement, though at a higher cost.
Q2: What is the minimum order quantity (MOQ) for UNS R60705 zirconium wire?
The typical minimum order quantity is 100 kg. Small-batch orders may incur additional production preparation fees.
Q3: What is the lead time for UNS R60705 zirconium wire?
Standard specifications have a lead time of 4–8 weeks. Special specifications or large-volume orders may require 8–12 weeks.
Finding a Reliable UNS R60705 Zirconium Wire Supplier
Baoji Titanium Valley Titanium Nickel Zirconium Material Processing Co., Ltd. is a specialized manufacturer of high-end rare metal processing products. Equipped with an Italian Danieli rolling production line, the company produces over 500 metric tons of zirconium wire annually and provides full-size customization with EN 10204 Type 3.1 certification services. Contact us now for technical support and quotation: sales@titaniumvalleys.com
For a broader view of available grades, supply forms, and related specifications, explore our Zirconium Wire category.
For product-level details and supply options, you can also review our UNS R60705 Zirconium Wire page.
References
ASTM B551-21 Standard Specification for Zirconium and Zirconium Alloy Bars and Rods. West Conshohocken: ASTM International, 2021.
GB/T 27634-2011 Nuclear-Grade Zirconium Alloy Pipes, Bars, and Wires. Beijing: Standards Press of China, 2011.